Commissioning 65/78
RE 66170-B/2019-05-15, Control block SB24/34, Bosch Rexroth AG
8.3.3 Air bleeding at control valves with EHS
The hydraulic fluid flow via ports
P
and
R
must be applied. The two consumer
ports
A1
and
B1
must be connected, e.g. by means of a hydraulic line.
NOTICE!
Air bleeding must be carried out first at the electrohydraulic EHS actuating
unit. Air inside the actuating unit can lead to vibrations at the control spool in
control position and an actuating time exceeding the programmed diagnosis limit.
The effect this exceeded time depends on the vehicle.
1.
Air bleeding at electrohydraulic actuating unit
– Connect the electrohydraulic actuating unit at the CAN bus connector with
the CAN bus control unit of the vehicle.
– Establish the pilot oil supply to the electrohydraulic actuating unit (
X
and
Rx
).
– At control blocks/control block segments with switchable pressure reducing
valve, this valve has to be switched on.
– Switch the directional valve at least 20 times with a frequency of 2 Hz between
100% lifting (spool position
1
) and floating (spool position
F
). Direction valves
without floating position are switched between 100% lifting (spool position
1
)
and 100% lowering (spool position
2
).
2.
Directional valve air bleeding
– Apply a hydraulic fluid flow through the directional valve for at least 20 seconds
and slowly set the valve spool from 0 or neutral position to the fine control
range of spool position
1
and
2
.
– Repeat this process several times.
– Switch spool positions
1
and
2
several times to maximum position.
SBx4-EHS
EHR24-EHS sa
EHR24-EHS da
